An anonymous email sent to Greece’s organized crime squad reportedly led to the identification of three people, and the arrest of two, on suspicion of causing the blaze that killed three office workers on the path of a massive anti-austerity protest in Athens 16 years ago.

The May 5, 2010 fire at a Marfin Bank branch on the capital’s central Stadiou Street killed three bank employees, including a pregnant woman, in one of the darkest incidents of the country’s nearly ten-year financial crisis.

Since then, no conclusive evidence had emerged on the identity of the masked youths who torched the building as tens of thousands marched past to protest further planned income cuts and tax hikes demanded by Greece’s bailout creditors.

The email sent to police is understood to have named the three suspects, as well as other people believed to have belonged to anarchist groups, and, in combination with newly revisited imagery from the scene of the arson attack, led police to issue three arrest warrants.

Two of the suspects, both men aged 42, were arrested, while Greek authorities have also issued an arrest warrant for a 46-year-old woman believed to be currently residing in the United Kingdom who allegedly played a secondary part on the attack.